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 ## General Rules
 
 - **Parallelise with subagents:** For every task, use multiple subagents with the appropriate model to work more efficiently. Dispatch independent subtasks in parallel rather than executing them sequentially.
+- **Subagent model selection (MANDATORY):** You MUST use the right model tier for each subagent — `claude-haiku-4.5` for fast/simple/mechanical tasks, `claude-sonnet-4.5` for default/standard implementation work, and `claude-opus-4.6` for complex reasoning or architecture decisions. Never use the same model for all subagents.
+- **Commit often:** `git commit` frequently — after each meaningful unit of work, not just at the end of a task.
 
 ## Build, Lint, and Test Commands